>>> violence on this christmas eve from upstate new york. where four firefighters have been shot at the scene of a fire, and two are confirmed dead, it happened early this morning, in webster, new york, a suburb of rochester. two firefighters are in guarded condition. no further information on the suspect. >>> and there are increased fears this morning about running off the fiscal cliff. the deadline for preventing tax hikes and government spending cuts is just one week from today. the president and congress return to washington later this week. it's likely they'll work right to new year's eve. one possibility is striking a deal on taxes but leaving the spending for later. >>> overseas now, where an american has been killed by an afghan policewoman. the attack took place at police head quarters in kabul. where there have been similar insider attacks, this is the first time a female security officer has been involved. >>> the nra is not backing away from its call for armed officers in our nation's schools. and the group vows to fight any effo